초인

채서진

Choi Soo-hyun

김정현

Choi Do-hyun

서영화

Yeon-hee

이우주

Library Kid

정종열

Library Janitor

Lee Chae-kyung

Psychiatrist

Им Хён Гук

Do-hyun's Father

양말복

Se-young's Mother

김민석

Min Sik

Jeong Jun-hwa

Chemist

Jo Jae-yeong

Mapo Bridge Man

문현정

Do-hyun's Aunt